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Full text of "The Cambridge Natural History"

CHARACTERS   OF   PHALANGERS

139

common integument as in the Maeropodidae. The hallux is oppos-
able and nailless. The tail is nearly always long and prehensile.
The pouch is -well developed; the stomach not sacculated; a
caecum is present (except
in Tarsipes). These
really the principal
tinctions between the

are
dis-
two

families. In addition, it
may he mentioned that the
lower incisors have not a
scissor-like action as in the
Kangaroos.

The Phalangers may he
divided into four sub-
families.

The first of these, that
of the PHALANGEBLNAE,
contains the genera Phal-
anger (including Cuscus),
d-crobates, Distaechurus,
Dromicia,, Gh/mnobelideus,
JPetaurus, Petauroides,
Dactylopsila, Pseudochirus,
and Trichosurus.

These genera agree in

the following generalities:---

Tail well developed, often
very long; three incisors
above, and at least two pre-
molars both above and

IF-

ect.cun, ecto-euneiform ;   ent.cun, eiito-cunei-
not         form ; fb, fibula ;   mes.cttn, meso-cuueiform ;

nav, navicular ; tib, tibia ;  /- T7; first to fifth
toes.    (After Owen.)

below ;     caecum     long     and   FlG. 68.—Bones of leg and foot of Pbalanger.    ast,
Simple ;      Stomach      Without         Astragalus ;   cede,   caleaneum ;   c«5,  cuboid
a cardiac  gland; liver
very complicated by second-
ary furrows, with a distinct
caudate  lobe;   the vaginal  median   culs-de-sac  often  coalesced;
lungs with an azygos lobe.
The second sub-family, PHASCOLAKCTINAE (with the Koala only),
is thus characterised :—Tail rudimentary ; cheek-pouches present;
superior incisors three, but only one premolar above and below;